Transconductance Amplifiers

Abstract

The operational amplifier is an extremely efficient and versatile device. Its applications span the broad electronic industry filling requirements for signal conditioning, special transfer functions, analog instrumentation, and computation, and special system design. The analog assets of simplicity and precision characterize circuits utilizing operational amplifiers. The part of the project is to design transconductance amplifier and calculate various parameters : Voltage Gain, Input and Output Impedence, Supply Voltage Rejection Ratio, Common Mode Rejection Ratio(CMRR) and Slew Rate to obtain the performance of the circuit. To improve the CMRR, we Implemented three types of OTA i.e. Simple Differential OTA, Fully Differential OTA and Balanced OTA. The Balanced OTA was observed to be the best out of three. In order to get the optimum value of CMRR we have proposed the design of Balanced OTA in which the Standard Current Mirror is replaced by –Bulk Driven Current Mirror and Low voltage Current Mirror.